Antenna and wave propagation
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- Draw the radiation pattern of half wave antenna placed vertically and horizontally.
- What is Directivity? Calculate its value for isotropic antenna.
- What is polarization and its significance in communication?
- List out various factors affecting the radio wave propagation.
- What is virtual height and critical frequency?
- What are the advantages of Dolph-Tchebyscheff distribution?
- What is super directive array?
- What is equivalent noise temperature of antenna?
- Explain Babinet’s principle.
- How does antenna acts as an impedance matching device?
- Show that the directivity of isotropic antenna is unifies.
- Define directivity of an antenna.
- Define beamwidth of an antenna.
- Write down the reasons for using an antenna array in practice.
- What are the advantages of ground wave propagation?
- Define critical frequency.
- Define maximum usable frequency.
- What is the difference between power gain and directive gain?
- What is the relation between effective area and directivity of antenna?
- In end fire array in what direction there is a maximum radiation?
- What are the conditions to produce radiations in a single wire?
- How much power does a 50ohm antenna radiate when fed a current of 5A?
- Define the term radian. How many radians are present in a circle?
- How noise temperature is related to the noise figure? Write an expression for the same.
- Define the term self impedance.
- Discuss the various regions present around the linear wire antenna during radiation.
- What is the importance of array factor?
- With the help of diagram differentiate rectangular and circular aperture antenna.
- Define the term optimum working frequency.
- Write a note on friis free space equation.